Allison Williams, a woman who has not (to the best of my knowledge) ever undergone a DNA paternity test, says you can trust her father.
So here's the scenario: You're idly perusing the online Rolodex of a new love or "luv" interest —his roster of Facebook friends—and you come across one or more instances of the following: "We hooked up and it was astonishing, obviously." "We hooked up and I'll never be the same again." "We hooked up and I felt connected to my body in a way I never had before. It was like being struck by lightning." What to think? Is your man some kind of slut analog of a Facebook Zombie or Vampire, but instead of "biting chumps" he is spreading whatever he has to spread IRL? Or is he a regular, relatively chaste sort of person whose friends think they are being funny?